Makes mopy turn off gtest coloring

Makes mopy turn off gtest coloring

Without this gtest could turn on coloring, which confuses the code
that searches the output. The specific error I was getting was re was
being passed a regular expression that contained escape sequences,
which triggered an exception in re saying the string wasn't balanced.

BUG=none
TEST=none
R=msw@chromium.org

Committed: https://crrev.com/6ffac75a0ae783badb17b13ab7e99e9b09bcedfd
Cr-Commit-Position: refs/heads/master@{#342701}

[sky, 2015-08-06 18:49:07]

Updated as we discussed.

[msw, 2015-08-06 18:50:20]

lgtm

[sky, 2015-08-06 20:03:48]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2015-08-06 20:04:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1279833003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1279833003/20001

[commit-bot: I haz the power, 2015-08-06 20:37:11]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-06 20:37:12]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[sky, 2015-08-10 20:27:31]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2015-08-10 20:28:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1279833003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1279833003/20001

[commit-bot: I haz the power, 2015-08-10 21:37:11]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-10 21:37:49]

Patchset 2 (id:??) landed as
https://crrev.com/6ffac75a0ae783badb17b13ab7e99e9b09bcedfd
Cr-Commit-Position: refs/heads/master@{#342701}